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sch: use LDO as voltage reference

This commit is contained in:
King Kévin 2022-04-12 15:16:06 +02:00
parent 09a33c8030
commit b7fce82fd8
1 changed files with 150 additions and 211 deletions
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361
pd_blocker.sch
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@ -257,214 +257,149 @@ T -6400 -600 9 10 1 0 0 0 3
capacitors block PD communication capacitors block PD communication
by smoothing out the 300 Kpbs signal, by smoothing out the 300 Kpbs signal,
but still permits Rx identification but still permits Rx identification
C -1400 6100 1 0 0 LM393D_part-1-2-COMP1.sym C -1400 6900 1 0 0 LM393D_part-1-2-COMP1.sym
{ {
T -1400 6100 5 8 0 0 0 0 1 T -1400 6900 5 8 0 0 0 0 1
footprint=SOIC127P600X175-8N.lht footprint=SOIC127P600X175-8N.lht
T -1000 7420 5 10 1 1 0 0 1 T -1000 8220 5 10 1 1 0 0 1
refdes=U1 refdes=U1
T -200 7360 5 10 1 1 0 0 1 T -200 8160 5 10 1 1 0 0 1
device=LM393D device=LM393D
T -1400 6100 5 10 0 1 0 0 1 T -1400 6900 5 10 0 1 0 0 1
lcsc=C2977085 lcsc=C2977085
} }
C 4800 6100 1 0 1 LM393D_part-2-2-COMP2.sym C 4800 6900 1 0 1 LM393D_part-2-2-COMP2.sym
{ {
T 4800 6100 5 8 0 0 0 6 1 T 4800 6900 5 8 0 0 0 6 1
footprint=SOIC127P600X175-8N.lht footprint=SOIC127P600X175-8N.lht
T 4400 7420 5 10 1 1 0 6 1 T 4400 8220 5 10 1 1 0 6 1
refdes=U1 refdes=U1
T 3600 7360 5 10 1 1 0 6 1 T 3600 8160 5 10 1 1 0 6 1
device=LM393D device=LM393D
T 4800 6100 5 10 0 1 0 0 1 T 4800 6900 5 10 0 1 0 0 1
lcsc=C2977085 lcsc=C2977085
} }
C 400 7800 1 270 1 40P05.sym C 400 8600 1 270 1 40P05.sym
{ {
T 400 7800 5 8 0 0 90 2 1 T 400 8600 5 8 0 0 90 2 1
footprint=SOT95P237X112-3N.lht footprint=SOT95P237X112-3N.lht
T 460 8860 5 10 1 1 180 8 1 T 460 9660 5 10 1 1 180 8 1
refdes=Q1 refdes=Q1
T 1340 8860 5 10 1 1 0 6 1 T 1340 9660 5 10 1 1 0 6 1
device=40P05 device=40P05
T 400 7800 5 10 0 0 0 0 1 T 400 8600 5 10 0 0 0 0 1
lcsc=C2886385 lcsc=C2886385
} }
C -400 5900 1 0 0 GND.sym C -400 6700 1 0 0 GND.sym
N -2000 8800 400 8800 4 N -2000 9600 400 9600 4
{ {
T -2000 8800 5 10 1 1 0 0 1 T -2000 9600 5 10 1 1 0 0 1
netname=VBUS1 netname=VBUS1
} }
C -1800 6200 1 270 1 ZENER.sym N -1400 7600 -1600 7600 4
{ {
T -1800 6200 5 8 0 0 90 2 1 T -1800 7600 5 10 1 1 0 0 1
footprint=SODFL1608X65N.lht netname=VREF
T -1300 6500 5 10 1 1 0 3 1
refdes=Z1
T -1800 6400 5 10 0 1 90 3 1
device=ZENER
T -1400 6200 5 10 1 1 0 0 1
value=4.7V
T -1800 6200 5 10 0 1 0 6 1
lcsc=C2832571
} }
C -1700 5900 1 0 0 GND.sym T 1900 10000 9 10 1 0 0 0 2
N -1600 6100 -1600 6200 4
N -1600 6600 -1600 7500 4
N -1400 6800 -1600 6800 4
{
T -1800 6800 5 10 1 1 0 0 1
netname=VREF1
}
T -6500 6300 9 10 1 0 0 0 2
R3 ≤ (Vsupply_min - Vzener) / Ileakage
R3 ≤ (4.75 - 4.7) / 2E-6 = 25k
C -1700 8400 1 270 0 resistor-1.sym
{
T -1300 8100 5 10 0 0 270 0 1
device=RESISTOR
T -1400 8000 5 10 1 1 0 0 1
refdes=R3
T -1400 7700 5 10 1 1 0 0 1
value=20k
T -1200 8200 5 10 0 1 270 0 1
footprint=UC1608X55N.lht
T -1700 8400 5 10 0 1 0 0 1
description=resistor, chip, 0603 (metric 1608), 1%
}
N -1600 8400 -1600 8800 4
T -6500 8700 9 10 1 0 0 0 2
Vgs limit (± 20V) never reached because Vgs limit (± 20V) never reached because
pulled low only when VBUS ≤ 5.5V pulled down only when VBUS ≤ 5.5V
T -6500 7500 9 10 1 0 0 0 2 C -2100 9200 1 270 0 resistor-1.sym
divider_ratio = Vref / Vover
divider_ratio = 4.7 / 5.5 = 0.8545
C -2100 8400 1 270 0 resistor-1.sym
{ {
T -1700 8100 5 10 0 0 270 0 1 T -1700 8900 5 10 0 0 270 0 1
device=RESISTOR device=RESISTOR
T -2200 8000 5 10 1 1 0 6 1 T -2200 8800 5 10 1 1 0 6 1
refdes=R1 refdes=R1
T -2200 7700 5 10 1 1 0 6 1 T -2200 8500 5 10 1 1 0 6 1
value=5k1 value=34k
T -1600 8200 5 10 0 1 270 0 1 T -1600 9000 5 10 0 1 270 0 1
footprint=UC1608X55N.lht footprint=UC1608X55N.lht
T -2100 8400 5 10 0 1 0 0 1 T -2100 9200 5 10 0 1 0 0 1
description=resistor, chip, 0603 (metric 1608), 1% description=resistor, chip, 0603 (metric 1608), 1%
} }
C -2100 7000 1 270 0 resistor-1.sym C -2100 7800 1 270 0 resistor-1.sym
{ {
T -1700 6700 5 10 0 0 270 0 1 T -1700 7500 5 10 0 0 270 0 1
device=RESISTOR device=RESISTOR
T -2200 6600 5 10 1 1 0 6 1 T -2200 7400 5 10 1 1 0 6 1
refdes=R2 refdes=R2
T -2200 6300 5 10 1 1 0 6 1 T -2200 7100 5 10 1 1 0 6 1
value=30k value=21k
T -1600 6800 5 10 0 1 270 0 1 T -1600 7600 5 10 0 1 270 0 1
footprint=UC1608X55N.lht footprint=UC1608X55N.lht
T -2100 7000 5 10 0 1 0 0 1 T -2100 7800 5 10 0 1 0 0 1
description=resistor, chip, 0603 (metric 1608), 1% description=resistor, chip, 0603 (metric 1608), 1%
} }
T -6500 7200 9 10 1 0 0 0 1 T -2700 7000 9 10 1 0 90 0 2
R2/(R1+R2) = 30/(5.1+30) = 0.8547 Vref = R2/(R1+R2) * Vover
C -2100 5900 1 0 0 GND.sym 2.1 = 21/(34+21) *5.5
N -2000 7500 -2000 7000 4 C -2100 6700 1 0 0 GND.sym
N -1400 7000 -2000 7000 4 N -2000 8300 -2000 7800 4
N -1400 7800 -2000 7800 4
{ {
T -1200 7000 5 10 1 1 0 6 1 T -1200 7800 5 10 1 1 0 6 1
netname=VOVER1 netname=VOVER1
} }
N -2000 8800 -2000 8400 4 N -2000 9600 -2000 9200 4
C 3000 7800 1 90 0 40P05.sym C 3000 8600 1 90 0 40P05.sym
{ {
T 3000 7800 5 8 0 0 90 0 1 T 3000 8600 5 8 0 0 90 0 1
footprint=SOT95P237X112-3N.lht footprint=SOT95P237X112-3N.lht
T 2940 8860 5 10 1 1 180 2 1 T 2940 9660 5 10 1 1 180 2 1
refdes=Q2 refdes=Q2
T 2060 8860 5 10 1 1 0 0 1 T 2060 9660 5 10 1 1 0 0 1
device=40P05 device=40P05
T 3000 7800 5 10 0 0 0 0 1 T 3000 8600 5 10 0 0 0 0 1
lcsc=C2886385 lcsc=C2886385
} }
C 3800 5900 1 0 1 GND.sym C 3800 6700 1 0 1 GND.sym
N 5400 8800 3000 8800 4 N 5400 9600 3000 9600 4
{ {
T 5400 8800 5 10 1 1 0 6 1 T 5400 9600 5 10 1 1 0 6 1
netname=VBUS2 netname=VBUS2
} }
C 5200 6200 1 90 0 ZENER.sym N 4800 7600 5000 7600 4
{ {
T 5200 6200 5 8 0 0 90 0 1 T 5200 7600 5 10 1 1 0 6 1
footprint=SODFL1608X65N.lht netname=VREF
T 5200 6400 5 10 0 1 90 5 1
device=ZENER
T 5200 6200 5 10 0 1 0 0 1
lcsc=C2832571
T 4700 6500 5 10 1 1 0 3 1
refdes=Z4
T 4800 6200 5 10 1 1 0 6 1
value=4.7V
} }
C 5100 5900 1 0 1 GND.sym C 5500 9200 1 90 1 resistor-1.sym
N 5000 6100 5000 6200 4
N 5000 6600 5000 7500 4
N 4800 6800 5000 6800 4
{ {
T 5200 6800 5 10 1 1 0 6 1 T 5100 8900 5 10 0 0 270 2 1
netname=VREF2
}
C 5100 8400 1 90 1 resistor-1.sym
{
T 4700 8100 5 10 0 0 270 2 1
device=RESISTOR device=RESISTOR
T 4600 8200 5 10 0 1 270 2 1 T 5000 9000 5 10 0 1 270 2 1
footprint=UC1608X55N.lht footprint=UC1608X55N.lht
T 4800 8000 5 10 1 1 0 6 1 T 5600 8800 5 10 1 1 0 0 1
refdes=R5
T 5600 8500 5 10 1 1 0 0 1
value=34k
T 5500 9200 5 10 0 1 0 0 1
description=resistor, chip, 0603 (metric 1608), 1%
}
C 5500 7800 1 90 1 resistor-1.sym
{
T 5100 7500 5 10 0 0 270 2 1
device=RESISTOR
T 5000 7600 5 10 0 1 270 2 1
footprint=UC1608X55N.lht
T 5600 7400 5 10 1 1 0 0 1
refdes=R6 refdes=R6
T 4800 7700 5 10 1 1 0 6 1 T 5600 7100 5 10 1 1 0 0 1
value=20k value=21k
T 5100 8400 5 10 0 1 0 0 1 T 5500 7800 5 10 0 1 0 0 1
description=resistor, chip, 0603 (metric 1608), 1% description=resistor, chip, 0603 (metric 1608), 1%
} }
N 5000 8400 5000 8800 4 C 5500 6700 1 0 1 GND.sym
C 5500 8400 1 90 1 resistor-1.sym N 5400 8300 5400 7800 4
N 4800 7800 5400 7800 4
{ {
T 5100 8100 5 10 0 0 270 2 1 T 4600 7800 5 10 1 1 0 0 1
device=RESISTOR
T 5000 8200 5 10 0 1 270 2 1
footprint=UC1608X55N.lht
T 5600 8000 5 10 1 1 0 0 1
refdes=R7
T 5600 7700 5 10 1 1 0 0 1
value=5k1
T 5500 8400 5 10 0 1 0 0 1
description=resistor, chip, 0603 (metric 1608), 1%
}
C 5500 7000 1 90 1 resistor-1.sym
{
T 5100 6700 5 10 0 0 270 2 1
device=RESISTOR
T 5000 6800 5 10 0 1 270 2 1
footprint=UC1608X55N.lht
T 5600 6600 5 10 1 1 0 0 1
refdes=R8
T 5600 6300 5 10 1 1 0 0 1
value=30k
T 5500 7000 5 10 0 1 0 0 1
description=resistor, chip, 0603 (metric 1608), 1%
}
C 5500 5900 1 0 1 GND.sym
N 5400 7500 5400 7000 4
N 4800 7000 5400 7000 4
{
T 4600 7000 5 10 1 1 0 0 1
netname=VOVER2 netname=VOVER2
} }
N 5400 8800 5400 8400 4 N 5400 9600 5400 9200 4
N 1600 8800 1800 8800 4 N 1600 9600 1800 9600 4
{ {
T 1500 8800 5 10 1 1 0 0 1 T 1500 9600 5 10 1 1 0 0 1
netname=VBUS netname=VBUS
} }
C -1200 -800 1 0 0 HEADER-2.54-1x10.sym C -1200 -800 1 0 0 HEADER-2.54-1x10.sym
@ -530,7 +465,7 @@ T 800 2300 5 8 0 0 0 0 1
footprint=CONNECTOR_XKB_U262-24XN-4BV60.lht footprint=CONNECTOR_XKB_U262-24XN-4BV60.lht
T 1200 4960 5 10 1 1 0 0 1 T 1200 4960 5 10 1 1 0 0 1
refdes=J2 refdes=J2
T 3760 2640 5 10 1 1 0 2 1 T 3760 2640 5 10 0 1 0 2 1
device=XKB_U262-24XN-4BV60 device=XKB_U262-24XN-4BV60
T 3300 5000 5 10 1 1 0 0 1 T 3300 5000 5 10 1 1 0 0 1
value=USB-C receptacle value=USB-C receptacle
@ -543,7 +478,7 @@ T -5600 2300 5 8 0 0 0 0 1
footprint=CONNECTOR_XKB_U261-24XN-4BC2LS.lht footprint=CONNECTOR_XKB_U261-24XN-4BC2LS.lht
T -5200 4960 5 10 1 1 0 0 1 T -5200 4960 5 10 1 1 0 0 1
refdes=J1 refdes=J1
T -2540 2640 5 10 1 1 0 2 1 T -2540 2640 5 10 0 1 0 2 1
device=XKB_U261-24XN-4BC2LS device=XKB_U261-24XN-4BC2LS
T -5600 2300 5 10 0 0 0 0 1 T -5600 2300 5 10 0 0 0 0 1
lcsc=C2880648 lcsc=C2880648
@ -553,96 +488,100 @@ value=USB-C plug
N -2700 2100 -2700 2300 4 N -2700 2100 -2700 2300 4
N -2900 2100 -2900 2300 4 N -2900 2100 -2900 2300 4
N -3100 2100 -3100 2300 4 N -3100 2100 -3100 2300 4
T -6500 9900 9 10 1 0 0 0 1 T -6900 10200 9 10 1 0 0 0 1
over-voltage protection over-voltage protection
T -6500 1500 9 10 1 0 0 0 1 T -6500 1500 9 10 1 0 0 0 1
communication protection communication protection
T -6500 9300 9 10 1 0 0 0 2 T -1600 10000 9 10 1 0 0 0 2
two pMOS are required to two pMOS are required to
block VBUS in both direction block VBUS in both directions
C -1300 9700 1 0 0 BAV74_part-1-2-D1.sym C -5800 9300 1 0 0 BAV74_part-1-2-D1.sym
{ {
T -1300 9700 5 8 0 0 0 0 1 T -5800 9300 5 8 0 0 0 0 1
footprint=SOT95P237X112-3N.lht footprint=SOT95P237X112-3N.lht
T -1100 10060 5 10 1 1 0 3 1 T -5600 9660 5 10 1 1 0 3 1
refdes=D1 refdes=D1
T -1100 9740 5 10 1 1 0 5 1 T -5600 9340 5 10 1 1 0 5 1
device=BAV74 device=BAV74
} }
C -100 9700 1 0 1 BAV74_part-2-2-D2.sym C -4600 9300 1 0 1 BAV74_part-2-2-D2.sym
{ {
T -100 9700 5 8 0 0 0 6 1 T -4600 9300 5 8 0 0 0 6 1
footprint=SOT95P237X112-3N.lht footprint=SOT95P237X112-3N.lht
T -300 10060 5 10 1 1 0 3 1 T -4800 9660 5 10 1 1 0 3 1
refdes=D1 refdes=D1
T -300 9740 5 10 1 1 0 5 1 T -4800 9340 5 10 1 1 0 5 1
device=BAV74 device=BAV74
} }
T -6500 8100 9 10 1 0 0 0 2 T -6600 8700 9 10 1 0 0 0 2
diodes prevent VBUS diodes prevent VBUS
cross-leakage cross-leakage
C -900 9900 1 0 0 VCC.sym C -5400 9500 1 0 0 VCC.sym
N -1300 9900 -2000 9900 4 N -5800 9500 -6500 9500 4
{ {
T -1300 9900 5 10 1 1 0 6 1 T -5800 9500 5 10 1 1 0 6 1
netname=VBUS1 netname=VBUS1
} }
N -900 9900 -500 9900 4 N -5400 9500 -5000 9500 4
N -100 9900 600 9900 4 N -4600 9500 -3900 9500 4
{ {
T -100 9900 5 10 1 1 0 0 1 T -4600 9500 5 10 1 1 0 0 1
netname=VBUS2 netname=VBUS2
} }
C 3500 7700 1 0 0 VCC.sym C 3500 8500 1 0 0 VCC.sym
C -500 7700 1 0 0 VCC.sym C -500 8500 1 0 0 VCC.sym
C 500 8800 1 90 1 resistor-1.sym C 500 9600 1 90 1 resistor-1.sym
{ {
T 100 8500 5 10 0 0 270 2 1 T 100 9300 5 10 0 0 270 2 1
device=RESISTOR device=RESISTOR
T 200 8400 5 10 1 1 0 6 1 T 200 9200 5 10 1 1 0 6 1
refdes=R3
T 200 8900 5 10 1 1 0 6 1
value=100k
T 0 9400 5 10 0 1 270 2 1
footprint=UC1608X55N.lht
T 500 9600 5 10 0 1 0 6 1
description=resistor, chip, 0603 (metric 1608), 1%
}
N 400 8700 400 8600 4
N 400 8600 800 8600 4
C 2900 9600 1 270 0 resistor-1.sym
{
T 3300 9300 5 10 0 0 270 0 1
device=RESISTOR
T 3400 9400 5 10 0 1 270 0 1
footprint=UC1608X55N.lht
T 3200 9200 5 10 1 1 0 0 1
refdes=R4 refdes=R4
T 200 8100 5 10 1 1 0 6 1 T 3200 8900 5 10 1 1 0 0 1
value=100k value=100k
T 0 8600 5 10 0 1 270 2 1 T 2900 9600 5 10 0 1 0 6 1
footprint=UC1608X55N.lht
T 500 8800 5 10 0 1 0 6 1
description=resistor, chip, 0603 (metric 1608), 1% description=resistor, chip, 0603 (metric 1608), 1%
} }
N 400 7900 400 7800 4 N 3000 8700 3000 8600 4
N 400 7800 1000 7800 4 N 2600 8600 3000 8600 4
C 1000 7600 1 0 0 BAV74_part-1-2-D1.sym N 800 8600 800 7700 4
T 700 7400 9 10 1 0 0 0 1
open-collector output
C -6400 7100 1 0 0 HT75xx-3.sym
{ {
T 1000 7600 5 8 0 0 0 0 1 T -6400 7100 5 8 0 0 0 0 1
footprint=SOT95P237X112-3N.lht footprint=SOT95P280X145-5N.fp
T 1200 7960 5 10 1 1 0 3 1 T -5850 8260 5 10 1 1 0 3 1
refdes=D2 refdes=U2
T 1200 7640 5 10 1 1 0 5 1 T -5340 7440 5 10 0 1 0 2 1
device=BAV74 device=HT75xx-3
T -5500 8300 5 10 1 1 0 0 1
value=HT7521-3
} }
C 2400 7600 1 0 1 BAV74_part-2-2-D2.sym T -6900 6400 9 10 1 0 0 0 2
Vref ≤ VBUSmin - D1_Vf - LM393_Vicm
Vref ≤ 4.75 - 0.715 - 1.5 = 2.5V
C -6600 8000 1 0 0 VCC.sym
C -5500 6900 1 0 0 GND.sym
N -4300 8000 -3700 8000 4
{ {
T 2400 7600 5 8 0 0 0 6 1 T -4200 8000 5 10 1 1 0 0 1
footprint=SOT95P237X112-3N.lht netname=VREF
T 2100 7960 5 10 1 1 0 3 1
refdes=D2
T 2200 7640 5 10 1 1 0 5 1
device=BAV74
} }
C 2900 8800 1 270 0 resistor-1.sym N 2600 7700 2600 8600 4
{
T 3300 8500 5 10 0 0 270 0 1
device=RESISTOR
T 3400 8600 5 10 0 1 270 0 1
footprint=UC1608X55N.lht
T 3200 8400 5 10 1 1 0 0 1
refdes=R5
T 3200 8100 5 10 1 1 0 0 1
value=100k
T 2900 8800 5 10 0 1 0 6 1
description=resistor, chip, 0603 (metric 1608), 1%
}
N 3000 7900 3000 7800 4
N 2400 7800 3000 7800 4
N 1400 7800 2000 7800 4
N 1700 7800 1700 6900 4
N 1700 6900 800 6900 4